Carbureter.



F. H. .HEITGERI CARBURETER.

APPLICATION FILED JUNE 8, 1912;

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FRANK H. HEITGER, OF INDIANAPOLIS, INDIANA,v ASSIGNOR TO HEITGERCRBURETOR COMPANY, 0F INDIANAPOLIS, INDIANA, A CORPORATION 0F INDIANA.

CARBUR-ETER.

Application mea June s, 1912.

T0 all whom z't may concern Be it known that I, FRANK H. HEITGER, a.citizen of the United States, residing at Indianapolis, Marion county,and State of Indiana, have invented and discovered certain new anduseful Improvementsin Carbureters, of Iwhich the following is a.specification.

My said invention consists in certain improvements in the details ofconstruction of carbureters for internal combustion engines, especiallyof the class designed for use on motor cycles and automobiles, wherebythe valve for controlling the auxiliary air supply to the mixing chambermay be held under a tension adjusted to suit the requirements of theconditions under which the engine is operating,as toatmosphere,temperature, etc., which tension may be quickly and conveniently changedor adjusted to' suit changed conditions, all as will 'be hereinaftermorefully described and claimed.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts, Figure 1is a side elevation of a carbureter embodying my said invention, Fig. 2a central vertical section through the top portion thereof, Fig. 3 aFig. 4 a perspective view showing the regulating valve separately forauxiliary air supply, and Fig. 5 a view showing a modification in theconstruction.

In said drawings the portions marked A represent the casing or body ofthe mixing chamber, B the float chamber or gasolene reservoir and C themain or hot air inlet thereto.

The main structure `of the carbureter shown is of the form in common useknown as the Heitger carbureter but may be of any approved form orconstruction and requires no special description except inV so far as itis modified by my present invention.

The casing A contains the mixing chamber, the mixture coming into samein the usual manner through suction tube 25. Said casing is providedwith an air cage a for the auxiliary air inlet and a mixture outlet a1.

The auxiliary air inlet through the air cage a is controlled by a valve10 mounted upon the inner end of a torsional spring 11, the opposite endof said spring being made fast to a rock-shaft 12, which is journaledSpecification of Letters Patent.

,formed with projecting top or plan view,

Patented apes, 1era. Serial No. 702,612.

insuitable bearings inthe sides of a hollow lug 17 on the top of casingA.' Said rockshaft projects through the sides of said lug end and has alever 13 mounted rigidlyon one outside end by which it may be turned.Said lever 13 depends from said shaft 12 and near its lower end engageswith a toothed segment 14 on'the adjacent side of casing A. Said segment14 is points l5 and 16 at its respective ends which serve to limit theswing of said lever 13. The teeth in said segment are of the form bestshown in Fig.

and on one 3 and adapted to hold said lever against rany backwardmovement by the horizontal right- `angular faces Which engage with therear edge of said lever, while their tapered faces permit said lever tobe swung forward by merely pushing from the rear side.

As Will be readily seen the tension of the spring 11 tends to hold valve10 to its seat against the inner end of air cage a lof said casing A.normally keeping the auxiliary air inlet closed. The spring 11 willyield under any air pressure against lvalve 10 caused by internalsuction sufficient to' overcome its tension, permitting said valve toopen and..y air from the outside to ,pass in through air cage a to saidmixing chamber. By turning lever 13 in a direction to wind up spring 11,its tension is valve is held to its seat under greater pressure whilewhen turned in the opposite direction the springis unwound and itstension decreased, permitting said valve to open under lesser pressure.Thus, where a smaller quantity of air is desired in the mixture, theoperator by throwing lever 13 backward increases the tension of thespring and decreases the quantity of air admitted while when a largerquantity is desired the operator withdraws lever 1 3 away from thesegment 14' sufficiently to disengage its edge from'the notches thereinand swings it forward to secure the tension desired. The square orhorizontal front face of the respective notches insures that the leverwill be securely held against the internal suction, or vacuum, in thechamber and only moved when forcibly released as above described. A lug18 is cast on the interior of casing A in position` to limit the inwardswing of valve 10 at the point desired.

In Fig. 5 I have illustrated a modification by which the lever 13 may beoperated from low lug extending outwardly any point, as the front seatof an automobile, through the medium of a connecting rod 20, pivotedthereto and extending to an operating lever or handle convenientlylocated adjacent to the point desired. A set-screw l21 is arranged tolimit the normal low tension of thespring and the backward movement oflever 13 will be held by the locking of said operating lever by anycommon means, not shown.

Having thus fully described my said invention what l claim as new anddesire to secure by Letters Patent is A carbureter comprising a mixingcham ber having an auxiliary air inlet and a holat one side of said airinlet formed with bearings in its sides for a rock shaft, a rock shaftmounted 1n said bearings, a helical spring mounted around said rockshaft within' said hollow` lug vwith its inner end rigidly attached tosaid rock shaft and its other end projecting i spring with its hundredand twelve.

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to a point beyond the center' of the auxiliary air inlet, a valvecomposed of rigid material mounted on the extending end of said outerface adapted to bear against the inner edge of said auxiliary air inletor closing the same, a crank arm mounted on one end of said rock shaftoutside of said lug, and means for adjusting said crank arm and securingit in difl'erent adjusted positions, whereby the tension oi' Said springmay be varied during operation to suit the requirements of thecarbureter under varying conditions, substantially as set forth. f

ln witness whereof l have hereunto set my hand and seal at indianapolis,indiana, this twenty-first day of FRANK H. l-lEl'lGrER.

llVitnesses:

E. W. BRADFORD,l

A. C. Rien.

May, D. nineteen

